Exploration of potassium modification on iron-zirconium oxygen carriers and potassium element forms in coal chemical loop combustion
The effects of preparation conditions on the properties of oxygen carriers were investigated,and the effects of temperature and reduction degree(Rox)on the occurrence of potassium were investigated by HSC Chemistry.The results showed that the optimal preparation conditions were as follows:the addition of ZrO2 was 30%,the addition of K2CO3 was 5%,and the calcination temperature of oxygen carrier was 800℃.In the case of coal excess,the occurrence form of potassium at high temperature is mainly gaseous potassium elemental K(g).When the oxygen carrier content in the system is sufficient or excessive,the main occurrence form of potassium changes to KFeO2 at high temperature.And only when the reaction temperature is low and the degree of oxygen carrier reduction is deep,can potassium remain in its original form of K2CO3.
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